Which word in the sentence is an open compound class you use a processor and typewriter?

The word "typewriter" is an open compound class in the sentence "you use a processor and typewriter."

Here's why:

* Open compound classes are formed by combining two or more words to create a new word with a distinct meaning. They are often written as separate words, but can also be hyphenated or combined into a single word.

* Typewriter is a combination of "type" and "writer," two separate words that together denote a machine for writing text.

* Processor is a single word that describes a device that performs calculations, and is not a compound word.

Therefore, "typewriter" is the open compound class in the sentence.